Explicación paso a paso:
[tex]4 - x - 2(x + 1) = - 2x \\ 4 - x - 2x - 2 = - 2x \\ 2 - 3x = - 2x \\ 2 = 3x - 2x \\ 2 = x[/tex]
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Explicación paso a paso:
[tex]4 - x - 2(x + 1) = - 2x \\ 4 - x - 2x - 2 = - 2x \\ 2 - 3x = - 2x \\ 2 = 3x - 2x \\ 2 = x[/tex]